At its most basic: the heat index is what the temperature feels like when you're outside. The chart above shows the combination of air temperature with humidity. It's very important to note the chart ...

A map shows areas in California where temperatures are expected to surpass 100 this week. There has been an early-season heat wave in Southern and Central California. On Monday, people in four states ...

Spain's weather agency AEMET has issued an alert that a heatwave will hit the country from May 26 to 28, with temperatures in ...

Storm systems are sweeping across parts of the US Midwest and South, leaving at least 21 dead, including nine people who were ...